PROBLEN IN THE ENGINE

Hello Dear,
My name is Silviya. Recently I change my drive belts on Hyundai Elantra 2003. The day after, there was a noise when the engine starts, so I called the mechanic (I was concern because on next day we were going on long trip), and he said it is not a problem t be concern about and he will adjust the belts after we come back. Obviously the belts were not adjusted in the cog area. Is it possible If the belts were to tie to transform pressure to one of the metal part of the engine or the gasket, which part failed and came out, in turn allowing the crankshaft has to move and push out the crankshaft seal, causing a large oil leak coming from the crankshaft pulley area.

I do not change the timing belt. I change the drive belts. After there was a noise like they were to tie. My question is: Is it possible If they were to tie to transform vibration from crankshaft puller which will make harmonic dampener comes off and give pressure to the crankshaft which pop out the crankshaft seal and course huge oil leak coming from the crankshaft pulley area.